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On the Road

Four vehicles travelled on a road. What can you deduce from the times that they met?

Enclosing Squares

Can you find sets of sloping lines that enclose a square?

Intersections

Change one equation in this pair of simultaneous equations very slightly and there is a big change in the solution. Why?

Painting Between the Lines

Age 11 to 16
Challenge Level
Here is the well-known landmark given by the instructions:

Eiffel tower